Carnegiea gigantea, Giant Saguaro

Southwest Desert Flora

Home to the plants of the Sonoran, Chihuahuan and Mojave Deserts

Cirsium ochrocentrum, Yellowspine Thistle

Packera quercetorum, Oak Creek Ragwort

Packera quercetorum, Oak Creek Ragwort, Southwest Desert Flora Packera quercetorum, Oak Creek Ragwort, Southwest Desert Flora Packera quercetorum, Oak Creek Ragwort, Southwest Desert Flora   Packera quercetorum, Oak Creek Ragwort, Southwest Desert Flora Packera quercetorum, Oak Creek Ragwort, Southwest Desert Flora   Packera quercetorum, Oak Creek Ragwort, Southwest Desert Flora


Scientific Name: Packera quercetorum
Common Name: Oak Creek Ragwort
Also called:
Family: Asteraceae, Sunflower Family
Synonyms: (Senecio quercetorum)
Status: Native
Duration: Perennial, taproot
Size: To 3.5 feet
Growth Form: Forb/herb; erect from basal leaves, 1 or more stems, bluish-purple color on the lower stems help identify this species in the field; plants variable, coarse, glaucous, glabrous or tomentose.
Leaves: Green; mostly basal; pinnately divided with enlarged terminal lobe (lyrate); leaves to 3 inches long; basal leaves with stalks or petioles, upper leaves sessile with narrow clasping wings; margins toothed, variable.
Flower Color: Bright yellow; daisy-like flowers; radiate heads, ray flower with 8 to 13 ligulate florets; disk flowers numerous, orange; bracts below flower heads green with yellow tips; flower heads in clusters on tips of branches; fruit is an achene.
Flowering Season: March to May, blooms earlier and lasts longer in California; April to June.
Elevation: 3,500 to 6,000 feet.

Habitat Preferences: Upper desert, pinyon-juniper or pinyon-pine, chaparral, rocky hillsides and open areas.

Recorded Range: Oak Creek Ragwort is rare in the United States found only in Arizona and New Mexico. In Arizona, Oak Creek Ragwort is found in the north, northwest, central and southern part of the state and in central western New Mexico.

North America & US County Distribution Map for Packera quercetorum.

U.S. Weed Information: No data available.
Invasive/Noxious Weed Information: No data available.
Wetland Indicator: No data available.
Threatened/Endangered Information: No data available.

Genus Information: 55 species in Packera throughout the United States, Canada and Newfoundland. 10 species in Arizona previously belonging to the genus Senecio.

Comments: Oak Creek Ragwort is a tall robust showy upper desert spring bloomer that is primarily an Arizona species named after its type location in Oak Creek Canyon, Arizona. This species is never found in the field in large numbers, but always a delight to find isolated specimens.

Date Profile Completed: 07/11/2012, rev. 08/14/2012, 06/30/2015; Updated, 07/26/2015, updated format 10/10/2017
References:
U.S. Dept. of Agriculture, Natural Resources Conservation Service on-line database
Arizona Flora, Kearney, Thomas H., Peebles, Robert H., 1960, University of California Press, Berkley and Los Angeles, as Senecio quercetorum.
Debra K. Trock, FNA | Family List | FNA Vol. 20 | Asteraceae | Packera, Flora of North America Editorial Committee, eds. 1993+. Flora of North America North of Mexico. 16+ vols. New York and Oxford. (accessed 08/14/2012)
SEINet for synonyms, scientific names and recorded geographic locations, http://swbiodiversity.org/seinet/